linux-kernel - Re: [PATCH bpf-next v2 4/4] bpf, btf: Enforce destructor kfunc type with CFI

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Message-ID: <41b23698-b577-4dcc-ae43-6a7d5294dd9c@linux.dev>
Date: Fri, 25 Jul 2025 16:37:42 -0700
From: Yonghong Song <yonghong.song@...ux.dev>
To: Sami Tolvanen <samitolvanen@...gle.com>, bpf@...r.kernel.org
Cc: Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
 Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>,
 Andrii Nakryiko <andrii@...nel.org>, Martin KaFai Lau
 <martin.lau@...ux.dev>, Eduard Zingerman <eddyz87@...il.com>,
 Song Liu <song@...nel.org>, John Fastabend <john.fastabend@...il.com>,
 KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...ichev.me>,
 Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
 Jamal Hadi Salim <jhs@...atatu.com>, Cong Wang <xiyou.wangcong@...il.com>,
 Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next v2 4/4] bpf, btf: Enforce destructor kfunc type
 with CFI



On 7/25/25 2:44 PM, Sami Tolvanen wrote:
> Ensure that registered destructor kfuncs have the same type
> as btf_dtor_kfunc_t to avoid a kernel panic on systems with
> CONFIG_CFI_CLANG enabled.
>
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>

Acked-by: Yonghong Song <yonghong.song@...ux.dev>